HERE ARE THE BASICS:
Bonus costumes:
To use the bonus costumes, you must first complete the game once and unlock the "Extra Costume" option. Enter the following case-sensitive passwords and you will be prompted for that costume. Once entered, you can then equip them during game play.
Heather Shirt: HappyBirthDay
Onsen: I_Love_You
Block Head: PutHere2FeelJoy
Don't Touch: TOUCH_MY_HEART
God Of Thunder: GangsterGirl
The Ligh:; LightToFuture
Transience: ShogyouMujou
Killer Rabbit: BlueRobbieWin
Royal Flush: 01_03_08_11_12
Golden Rooster: cockadooodledoo
Transform Costume: PrincessHeart (Note: This is actually a key)
Zipper: Shut_your_mouth
Game Reactor T-shirt: SH3_Wrestlarn
Play-shirt: sLmLdGhSmKfBfH
UFO ending:
Successfully complete game and unlock the Princess Heart costume and the Heather Beam weapon. The Heather Beam is a special weapon which you can only use if Heather or Cheryl is not holding any weapon. Defeat all monsters and Bosses using only the Heather Beam. Note: The "Monster defeated" counter should read 0 kills.
Glitch: Pause canceling:
Almost all action scenes can be canceled (such as when you are going up or down from an elevator) with Start. However, there is a point in the final area where the lift scene can be canceled, but it will pause the game first. When you press Start again, the game will resume, but the lift scene will be canceled.